Basically. I've tried every tip/guide/instruction I can find on the internet and I cannot for the life of me get def_ui working at all. I've reinstalled multiple times. Clean installed Fallout 4. Used only the mod so it wouldn't conflict, changed all of my .ini so they would be set up correctly. Ran the flash player thing to create the hud I want. Saved it to def_con. Start the game. Nothing. I've been trying to make it work for something like 8 hours. Here's a little tidbit that might help. SO I was using a mod called "No hitmarkers -I wont let this one die-" And it was doing great. Then all of a sudden after installing "vault buddy" and trying to get that to work, which it didn't work either, all of a sudden I noticed my hit markers were back. so I reinstalled no hitmarkers and it wouldn't remove them. I uninstalled it and set about trying to get a different mod, found Def_Hud. Tried to get that working, looks like i've installed it correctly but it still does not change my hud at all. TL:DR ALl I wanted was hit markers gone and I think I broke my fallout.